Reenforced electric cable



H. WODTKE REENFORCED ELECTRIC CABLE Filed Sept. 20, 1921 INVENTOR.

I B Y A TTORNEYS Patented I 2, 1929.

UNITED; STATES 1,707,700 PATENT OFFICE.

vHANS WODTKE, OF BUFFALO, YORK, ASSIGNOR, BY 'MESNE ASSIGNMENTS, TOGENERAL CABLE CORPORATION, OF NEW YORK N. Y., A CORPORATION OF NEWJERSEY.

RIlENFOROED ELECTRIGL CABLE.

Application filed September 20, 1921. Serial 1T0. 501,890. p

This invention relates to electric cables and has for its object theproduction of a reenforced'armored cable, whichis simple inconstruction, economical of manufacture and capable of withstandinggreat strains, twist-- like characters designate corresponding parts inall the views.

Figure 1 is-an elevation of a cable embodying my invention, a portion ofthe rubber casing being partly removed laying bare the coiled metalarmor and the coiled armorbeing partly removed baring the rubbersheathing.

Figure 2 is a sectional view of one form of cable embodying myinvention.

Figure 3 is a, sectional view of another form thereof.

Figures 4, 5 and 6 are views similar to Fig. 1 of other forms of myarmored cable. a

This armored cable comprises a cable having the usual insulated andbraided conductor or conductors, a fibrous filler or covering ofsuitable material laid parallel with the conductor or conductors and asheathing as of rubber or rubber compound or similar niaterial aroundsaid conductor or conductors and fillers and in addition an armor aroundthe sheathing and also preferably a rubber casing or casing of rubbercompound or s milar material enclosing the armor and omcd to thesheathing through the passages in the armor. 1

In Fig. 1, 1 designates the insulated conductors, therebeing two showntwisted togather. One conductor or any plural num ber of conductors maybe embodied in the cable. 3 designates the filler or coverlng laidparallel with the conductors and 4 the sheathing of rubber.

5 is the armor which is a metal strand coiled spirally around thesheathing, and 6 is the casing of rubber, rubber compound or equivalentmaterial. The casing is joined to the sheathing t, or portion of thecable within the armor 5 through the spaces between the coils of thearmor 5, and hence the had to the accompanying drawings, in which armoris embedded'in theinner face of the casing .6, or the outer face of thesheathing.

The casing 6 is molded and compressed on the armor 5 by passing thecable between molds consisting of upper and lower sections, one sectionbeing movable under pressure toward and from the other. A given lengthof cable, say for instance, fifteen feet is passed between the moldsections and the casin molded and compressed. The molds.65

are then opened and the next fifteen feet subjected to the operation ofthe molds, and

so on throughout the length of the cable whatever such length maybe.

.In Fig. 3, a cable is shown composed of conductors arranged side byside and each consisting-of a plurality or bunch of wires. 7 designatesthev conductors. 8 is-the' insulation of rubber or equivalent materialaround the same. 9 is the braid and 10 is the rubber sheath. 11designates the spirally wound armor, and 12 the protective" casing ofrubber or equivalent material. The metal armor, as clearly shown in thedrawin gs, is approximately semi-elliptical in cross section with itsflat face disposed inwardly. This construction and arrangement has amongits advantages the presentation of a broad flat surface to the rubbercompound whereby any blows of pressureupon the metallic strip will notcause the same to cut into the rubber and the provisionof a roundedouter surface whereby the catching or scraping of articles by the cablewhen moved thereover will be avoided. In the form shown in Fig. 3, theentire cable is oblong in cross section instead of circular as in'Figs.

.1 and 2.

or similar material, with the peripher of the armor exposed onthe-periphery o the sheathing. In Fig. 5 the sheathing designated 15 issurrounded by a metal armor 16 as in Fig. 5, and the armor surrounded bya molded casing 17 compressed on the armor 16 and sheath 15 and securedto the sheathing '15 and an additional armor 18 embedded in the; outerface of the casing and exposed on the outslde face or periphery thereof.

In Fig. 6, a cable is shown similar to that seen in Fig. 5, with theouter spirally wound armor 19 similar to the armor 18 embedded in theouter face of the compressed molded casing, and the inside arm or as 16in Fig. 5 omitted.

My reenforced cables, on account of the rubber casing, around the coiledarmor and joined to the sheathing beneath the armor, are practicallyunkinkable and capable of withstanding stresses and bending, twistingand crushing strains and abrasions under all working conditions.

What I claim is:

1. An electric cable, comprising in combi nation, one or more insulatedelectrical conductors, a surrounding sheath of vulcanized rubberinsulating compound, and a metallic strip having an inwardly disposedflat surface and an outwardly disposed rounded surfaceapplied to saidsheath in the form of an open helix and so located with respect to thenormal surface of the sheath that the angular edges of the strip areembedded in and covered by the material of the sheath.

aroaroo 2. An electric cable, comprising in combination, one or moreinsulated electrlcal conduetors, two surroundlng concentrlc sheaths ofvulcanized rubber insulating compound 25 united to each other byvulcanization under pressure, a helicoidal metallic strip locatedbetween said sheaths and having its convolutions separated from eachother by substantially the width of said strip, and a second 30 metallicstrip of semi-elliptical cross section encircling the outer sheath inthe form of an open helix with the flat surface of the strip toward thesheath and rounded surface out:-

ward, the angular edges of the strip lying HANS l/VODTKE.

Patent No. it, 107, 701i.

Granted April 2, i929, to

HANS Woman.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows:

Rage 1, line 78., beginning with the article "The" strike out all to andincluding the word and period "avoided. in line 90; page 2, line 9,following the period, insert "The metal armor, as

clearlyshown in the drawings, is approximately semi-elliptical in crosssection with its flat lace disposed inwardly.

This construction and arrangement has among its advantages thepresentation of a broad flat surface to the rubber compound where by anyblows of pressure upon the metallic strip will not cause the same to cutinto the rubber; and the provision of a rounded outer surface wherebythe catching or scraping of articles by the cable when moved thcreoverwill be avoided."- and that the said Letters Patent should be read withthese corrections therein that the same may conform to the record of thecase in the Patent Office. Signed and sealed this 18th day of June, A.D. 1929..

(Seal) M. J. Moore, Acting Commissioner of Patents.

QERWECME m GQRRECHQN.

9atemi; Na}. LI WJW. Gmmied April 2, 5929, m

Ki; is hereby certified thai ens: apgeaas in printed 5 pm asm'e numberedpatent requiring mn'ectim; is flows: Eage 'i H Wifiz i521 iace fiisgwsedinwardly E its ailvantages the pY8SfitMii3i1 af 3215 sawiacfi w the mmcemgaund Where by any News 0i: pressure upon the is WEN mi: v'ssa thesame to ut into ti a'ufnber; and the pmvisicm 0% a: sufiam whfleiy iizacatfiiziqhg or swaying @E articles by the cabiewvben amv flzemme Wmm'uidefi; and that said Lettem Pawn smzid be Wih {*EFSQ wxreciiilsheyein ihat the same may wni'firm t0 the record 0)? the ifi Q-EfizaSaigneai and seafisd this 18th eiay Q3? Jame 11. D. 1929.

13'. Mame, (Seal) Acting Czammissioner 0% Patents.

